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= How can I be sure that is working correctly?

Check your smtp server and see if it is started.

= How can I configure it?

1. Make sure your smtp server is started.
2. Go in the Mass Mail Setup panel of the script and fill in your details about your group. Table name - the table where the users are stored Table email field - the Email field from the table you put in Table name Sender email - the sender email that will arrive in the mails of users.

= How can I configure Sender email?

You can put in Sender email field an usual email like myemail@domain.com or you can use something like My Name myemail@domain.com, so that the sender of the email look more friendly to the user.

= How can I change to what group I send?

You should check you wordpress database and select the table you wanna send mass email, put the name of the table and the name of the table email field and click Save & Send Mails ->